On Fri, Jun 20, 2025 at 03:00:00PM +0530, Viresh Kumar wrote:

Hello,

As discussed yesterday during the call, I have prepared the list of instructions to reproduce my virtio-msg loopback setup. Please give a try and lemme know if something doesn't work.

This is based on the latest version of the spec (from Bill's latest pull request today).

Thanks Viresh!

I rebased the AMP drivers on top of your new branches and updated QEMU. QEMU now has a (work-in-progress) virtio-msg-amp-pci device that works with the virtio_msg_amp_pci driver.

I had to make a small change in the kernel's virtio-msg transport: https://github.com/edgarigl/linux/commit/9fe1cf81f95eb495f50ab1e574bf9a414d6...

Instructions on how to use the virtio-msg-amp-pci device: https://github.com/edgarigl/qemu/blob/edgar/virtio-msg/docs/devel/virtio-msg...

Short version: qemu-system-x86_64 -M q35 -m 2G \ -serial mon:stdio \ -nographic -display none \ -append 'rdinit=init console=ttyS0,115200,8n1 acpi=debug' \ -device virtio-msg-amp-pci \ -device virtio-net-device,netdev=n1,bus=/q35-pcihost/pcie.0/virtio-msg-amp-pci/vmsg.0/virtio-msg/virtio-msg-proxy-bus.0 \ -netdev user,id=n1 \ -kernel arch/x86/boot/bzImage \ -initrd xen-image-minimal-genericx86-64.rootfs.cpio.gz

Cheers, Edgar

-- Viresh

[1] https://linaro.atlassian.net/wiki/spaces/HVAC/pages/30104092673

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